Indications for placing abdominal drainage in peritonitis are large extent of necrotic tissue, prevention of gastrointestinal fistulae, excessive oozing of fluid and blood from the surgical site, and formation of a limited abscess. 1. Large extent of necrotic tissue: If the necrotic foci of peritonitis cannot be completely removed and there is a large area of necrotic tissue that cannot be removed, abdominal drainage needs to be placed. 2. Prevention of gastrointestinal fistula: to prevent fistula in the gastrointestinal tract after surgery or perforation repair, abdominal drainage should be placed in a timely manner. 3. Surgical site oozing fluid, oozing blood: need to be placed through the abdominal drainage to relieve peritonitis cavity fluid, so that anti-inflammatory treatment effect is better. 4. Formation of limited abscess: If the drainage is not complete, it will easily lead to recurrence, resulting in the possibility of multiple surgeries, so it is necessary to place drainage to speed up the patient’s recovery. Peritonitis should be placed according to the actual situation of abdominal drainage, if there is discomfort to communicate with the doctor in time, do not make decisions without authorization, so as not to cause aggravation of the disease.